N'DJAMENA (Reuters) - Chad's army said its forces had killed hundreds of Boko Haram militants and lost nine of its own troops in clashes in northern Nigeria on Wednesday.

Soldiers from Chad and Niger drove the insurgents from Malam Fatori, one of Boko Haram's last major footholds near Nigeria's border with Niger, earlier this week. Wednesday's clashes took place as they were mopping up.